Contents
What is the primary olfactory pathway?
The primary olfactory pathway is comprised of two components, the olfactory epithelium (OE) and the olfactory bulb (OB). The secondary olfactory pathway includes multiple cortical regions, all of which are directly innervated by OB projection neurons, and are collectively referred to as the olfactory cortex.
What is the olfactory pathway quizlet?
Odorant molecules dissolve in the mucous layer of the olfactory epithelium. The chemicals bind to G-protein receptors on the cilia, causing a cascade of events to open ion gates to open. This makes the cell depolarize.
What is the structure of the olfactory tract?
The olfactory tract is an inclusive structure that contains fibers of the lateral olfactory tract, cells of the anterior olfactory nucleus, and fibers of the anterior limb of the anterior commissure.
How does the olfactory pathway work?
The olfactory epithelium, found within the nasal cavity, contains olfactory receptor cells, which have specialized cilia extensions. The cilia trap odour molecules as they pass across the epithelial surface. Information about the molecules is then transmitted from the receptors to the olfactory bulb in the brain.
What is the main olfactory system?
The main olfactory system is involved in the processing of volatile odors detected at the level of the main olfactory epithelium in the nasal cavity. Sensory neurons send axons to glomerular cell layer of the main olfactory bulb (MOB) where they synapse with dendrites of mitral and tufted cells.
What is the pathway for Gustation?
The gustatory neurons innervate gustatory relay neurons in the nucleus of the solitary tract (NST) in the medulla oblongata. Gustatory information is then transmitted to neurons in the parabrachial nucleus (except in humans, where this step is bypassed), then to the thalamic gustatory area, and gustatory cortex (Fig.
What is the olfactory tract?
The olfactory tract is a bilateral bundle of afferent nerve fibers from the mitral and tufted cells of the olfactory bulb that connects to several target regions in the brain, including the piriform cortex, amygdala, and entorhinal cortex.
What is the main function of the olfactory tract?
The function of the olfactory tract is to connect the olfactory bulb to multiple areas within the center of the brain.
What is the function of olfactory?
Olfactory system, the bodily structures that serve the sense of smell. The system consists of the nose and the nasal cavities, which in their upper parts support the olfactory mucous membrane for the perception of smell and in their lower parts act as respiratory passages.
What is unique about the olfactory pathway?
The olfactory system is thus unique among the sensory systems in that it does not entail a thalamic relay en route to the primary cortical region that processes the sensory information. The olfactory tract also projects to a number of other targets in the forebrain, including the hypothalamus and amygdala.
Where are the fibres of the olfactory pathway?
The Olfactory Pathway. The fibres of the olfactory nerves are processes of olfactory receptor cells lying in the epithelium lining the olfactory mucosa. The fibres of the olfactory nerves are processes of olfactory receptor cells lying in the epithelium lining the olfactory mucosa (Fig.
How are the nerves connected to the olfactory bulb?
The olfactory bulbs and all other parts of the olfactory pathways are telencephalic derivatives. Within the olfactory bulbs the olfactory nerves synapse on mitral cells whose axons project directly to the olfactory cortex. Olfactory Tract. The olfactory tract connects the olfactory bulb with the cerebral hemispheres.
Is the olfactory tract part of the cerebral cortex?
The olfactory tract also contains centrifugal fibres travelling to the olfactory bulb from various centres in the brain. These are shown in Fig. 16.5. The term olfactory cortex is applied to all areas of the cerebral cortex that receive direct fibres from the olfactory bulb.
What makes up the mitral relay neurons in the olfactory tract?
It is made up of the axons of mitral relay neurons. They are the medial and lateral divisions of the olfactory tract. It is important to note that the olfactory nerve is only one component of the overall pathway and is, in fact, made up of multiple nerve fibers/rootlets coming from the receptors cells. The pathway can be summarized as follows: